EP 1208579 A1 20020529 - LENS APERTURE STRUCTURE FOR DIMINISHING FOCAL ABERRATIONS IN AN ELECTRON GUN
Title (en)
LENS APERTURE STRUCTURE FOR DIMINISHING FOCAL ABERRATIONS IN AN ELECTRON GUN
Title (de)
LINSEN-ÖFFNUNGSSTRUKTUR ZUR REDUZIERUNG VON FOKALABERRATIONEN IN EINER ELEKTRONENKANONE
Title (fr)
STRUCTURE DE DIAPHRAGME DE LENTILLE DESTINEE A DIMINUER LES ABERRATIONS FOCALES DANS UN CANON A ELECTRONS
Publication
Application
Priority
- US 0040617 W 20000810
- US 14801099 P 19990810
- US 63450500 A 20000809
Abstract (en)
[origin: WO0111654A1] A main lens of an electron gun of a cathode ray tube is provided. The main lens receives a plurality of parallel and co-planar electron beams emitted by the electron gun. The lens focuses each electron beam along a respective one of a plurality of focal axes incident to a display surface. A first grid electrode is positioned substantially orthogonally with respect to the plurality of electron beams, the grid electrode includes a plurality of apertures. Each aperture focuses a respective one of the plurality of electron beams, each aperture is centered about a respective one of said focal axes and has a shape expressed by the equation (1), where a and b define the horizontal and vertical axis lengths, theta is an angle, which varies between 0 DEG and 360 DEG , with respect to the x axis, of a line between the origin (x=0, y=0) and a point on the edge of the aperture and the exponent n determines the deviance from ellipticity, and where 1 < n < 2. The shape of the plurality of apertures diminishes focal aberrations of the lens.
IPC 1-7
IPC 8 full level
H01J 29/48 (2006.01); H01J 29/50 (2006.01); H01J 29/56 (2006.01); H01J 29/62 (2006.01)
CPC (source: EP KR US)
H01J 29/503 (2013.01 - EP US); H01J 29/566 (2013.01 - EP US); H01J 29/62 (2013.01 - KR); H01J 29/624 (2013.01 - EP US)
Citation (search report)
See references of WO 0111654A1
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 0111654 A1 20010215; AU 7629700 A 20010305; CN 1193399 C 20050316; CN 1369106 A 20020911; EP 1208579 A1 20020529; JP 2003532975 A 20031105; KR 20020020959 A 20020316; US 6452320 B1 20020917
DOCDB simple family (application)
US 0040617 W 20000810; AU 7629700 A 20000810; CN 00811257 A 20000810; EP 00965610 A 20000810; JP 2001516217 A 20000810; KR 20027001730 A 20020208; US 63450500 A 20000809